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com.github.monnetproject.translation.fidel OSGi Bundle from the Monnet Project's translation.project project.
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/**
 * *******************************************************************************
 * Copyright (c) 2011, Monnet Project All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met: *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer. * Redistributions in binary
 * form must reproduce the above copyright notice, this list of conditions and
 * the following disclaimer in the documentation and/or other materials provided
 * with the distribution. * Neither the name of the Monnet Project nor the names
 * of its contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE MONNET PROJECT BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * *******************************************************************************
 */
package eu.monnetproject.translation.fidel;

import eu.monnetproject.translation.LanguageModel;
import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
import it.unimi.dsi.fastutil.ints.Int2ObjectMaps;
import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
import it.unimi.dsi.fastutil.objects.Object2IntMap;
import it.unimi.dsi.fastutil.objects.Object2IntMaps;
import it.unimi.dsi.fastutil.objects.Object2IntOpenHashMap;
import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;

/**
 *
 * @author John McCrae
 */
public class IntegerLanguageModelWrapper implements IntegerLanguageModel {

    private final LanguageModel languageModel;
    private final Object2IntMap wordMap = Object2IntMaps.synchronize(new WordMap());
    private final Int2ObjectMap invWordMap = Int2ObjectMaps.synchronize(new Int2ObjectOpenHashMap());
    //private int W = 0;

    public IntegerLanguageModelWrapper(LanguageModel languageModel) {
        this.languageModel = languageModel;
    }

    @Override
    public double[] get(Phrase phrase) {
        final List ls = new ArrayList(phrase.p.length);
        for (int i = 0; i < phrase.n; i++) {
            ls.add(invWordMap.get(phrase.p[i + phrase.l]));
        }
        final double[] score = new double[]{languageModel.score(ls)};
        if (Double.isInfinite(score[0]) || Double.isNaN(score[0])) {
            // Fallback case... try the lower-cased form
            final ListIterator lsi = ls.listIterator();
            boolean differs = false;
            while (lsi.hasNext()) {
                final String s = lsi.next();
                if (s != null) {
                    final String sl = s.toLowerCase();
                    differs = (!s.equals(sl)) || differs;
                    lsi.set(sl);
                }
            }
            if (differs) {
                return new double[]{languageModel.score(ls)};
            } else {
                return score;
            }
        } else {
            return score;
        }
    }

    @Override
    public int order() {
        return languageModel.getOrder();
    }

    @Override
    public Object2IntMap wordMap() {
        return wordMap;
    }

    @Override
    public Int2ObjectMap invWordMap() {
        return invWordMap;
    }

    private class WordMap extends Object2IntOpenHashMap {

        int W = 0;

        @Override
        public boolean containsKey(Object k) {
            return true;
        }

        @Override
        public int getInt(Object k) {
            if (k instanceof String) {
                if (super.containsKey((String) k)) {
                    return super.getInt(k);
                } else {
                    synchronized(this) {
                        super.put((String) k, W);
                        invWordMap.put(W, (String) k);
                    }
                    return W++;
                }
            } else {
                throw new IllegalArgumentException();
            }
        }

        @Override
        public Integer get(Object ok) {
            return getInt(ok);
        }
    }
}